Free Online TSV to CSV

1. Paste your tab-separated data into the input box.
2. The CSV output is generated instantly with correct quoting applied.
3. Verify that fields containing commas are wrapped in double quotes.
4. Copy the CSV or download it as a .csv file.
5. Import the result into your spreadsheet or database.

Tab-separated values (TSV) is the same idea as CSV but with tab characters between fields. It is the default when you copy cells out of a spreadsheet and a common export format from databases and scientific tools. Converting TSV to CSV is mostly a delimiter swap — but a naive find-and-replace breaks the moment a field already contains a comma, because that comma would then look like a new column boundary.

This tool handles it correctly. It splits each line on tabs, then writes the fields back joined by commas, wrapping any field that contains a comma, a double quote, or a line break in double quotes and doubling internal quotes — exactly the escaping RFC 4180 specifies. The result imports cleanly into spreadsheets, databases, and analytics tools that expect comma-delimited input.

Use it whenever a downstream system insists on CSV but your source data arrived tab-separated, or when you want a single standardized format across a batch of mixed exports. The conversion runs entirely in your browser, so the data never leaves your device.